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811.
Kevin K. Moorhead 《Environmental management》1990,14(2):241-247
Hydric soils are used as supportive evidence for wetland delineations by federal and state agencies and by the private sector
in North Carolina, USA. An analysis of hydric soil distribution and hydric soil characteristics was conducted with county
soil surveys and soil taxonomy of the USA. Approximately 100 hydric soils have been used for soil mapping in North Carolina,
and they represent seven of the ten soil orders in soil taxonomy. An estimated 23% (2.9 million ha) of the land surface area
in North Carolina supports hydric soils.
Approximately 96% of the known hydric soil acreage was found in the coastal plain of North Carolina. Over one-third of the
soils were hydric Ultisols, which represented close to 10% of the land surface area. The other soil orders with extensive
hydric soil acreage included Histosols, Inceptisols, and Entisols. The soil orders were separated into great groups of soil
taxonomy to discuss soil profile characteristics. Landscape positions and associated wetland communities were also presented.
In North Carolina, a statewide inventory of wetlands does not exist and soil surveys offer a resource for a first approximation
of wetland boundaries. 相似文献
812.
保护生存环境、倡导绿色生活、提高人居环境,已成为当今世界发展的主流。创建绿色人居环境社会形象是把环境保护落实到基层社区的有效途径。我区许多地方近年来也纷纷在社区(小区)开展绿色创建活动。本文就绿色社区的创建、涵义、社会意义和发展等方面作简要的阐述和概括。 相似文献
813.
通过最新的遥感油气勘查,结合已有的油气地质和油气地球化学资料,对藏北地区油气资源进行了初步评价,认为该地区油气资源总量为40~60亿t左右。勘查重点放在羌塘地区的西北部,尤其是地球化学异常低值区具有大型推覆体构造的复合部位,最有希望找到亿吨以上整装油气田。 相似文献
814.
应用PFU法监测印染废水净化效能的研究 总被引:5,自引:0,他引:5
应用PFU法对印染废水净化效能进行了监测。结果表明:微型生物群落的结构参数和功能参数均较好地反映了印染废水的净化效能,水体流速对群集速度有一定的影响。 相似文献
815.
In this paper, the role played by habitat diversity in the landscape on species richness and on the stability of farmland bird communities was investigated. Species richness was estimated on 374 samples monitored in farmland by the French breeding bird survey during the 2001–2005 period. A capture–recapture approach was used to estimate species richness accounting for the variation in detection probability among species of the 100 most common species detected in farmland. Landscape structure and composition were measured both in farmland and in adjacent habitats. The independent effect of each variable on community richness and stability was further assessed using hierarchical variance partitioning and taking spatial autocorrelation into account. A strong matrix effect was detected: non-cropped land deeply influenced richness and stability of bird assemblages. 相似文献
816.
817.
不同放牧强度对红三叶、黑麦草草地植被和土壤养分的影响 总被引:3,自引:0,他引:3
对不同放牧强度下草地植物和土壤的变化规律进行了研究,结果表明:3年强度放牧使土壤的全氮含量和草地的组成和结构发生了较大的变化,使牧草产量下降17.1%,草地主要种红三叶的重要值降低了33.8%,均质度系数增加51.1%,土壤的氮磷比升高1.3。轻度放牧使草地全氮含量降低0.096%,红三叶的均质度系数增加21.0%。中度放牧并未使草地牧草产量和红三叶的重要值降低,同时使草地红三叶均质度系数保持在远低于1.0水平以下,但使土壤全氮含量下降0.085%。根据以上结果,中度放牧是保持草地持续高产的最好的放牧管理选择。 相似文献
818.
住宅小区景观用水水环境保护应用 总被引:4,自引:0,他引:4
随着房地产行业的蓬勃发展,人们对居住环境的要求也越来越高,水景已成为住宅小区环境设计的亮点。结合武汉某住宅小区水环境治理工程的实践,提出住宅小区景观用水水环境治理措施。 相似文献
819.
820.
Jiachun Yang Li Zhang Shuang Lan Quanhao Dou Shiwei Hao Yueping Wang Xiaoxuan Wang Ruoyan Zhang Yongzhen Peng 《环境科学学报(英文版)》2023,35(2):952-962
The long-term impact of fulvic acid (FA) on partial nitritation (PN) system was initially examined in this study. The obtained results revealed that the FA lower than 50 mg/L had negligible effect on the nitrite accumulation rate (NAR nearly 100%) and ammonium removal rate (ARR 56.85%), while FA over 50 mg/L decreased ARR from 56.85% to 0.7%. Sludge characteristics analysis found that appropriate FA (<50 mg/L) exposure promoted the settling performance and granulation of PN sludge by removing Bacteroidetes and accumulating Chloroflexi. The analysis of metagenomics suggested that the presence of limited FA (0-50 mg/L) stimulated the generation of NADH, which favors the denitrification and nitrite reduction. The negative impact of FA on the PN system could be divided into two stages. Initially, limited FA (50-120 mg/L) was decomposed by Anaerolineae to stimulate the growth and propagation of heterotrophic bacteria (Thauera). Increasing heterotrophs competed with AOB (Nitrosomonas) for dissolved oxygen, causing AOB to be eliminated and ARR to declined. Subsequently, when FA dosage was over 120 mg/L, Anaerolineae were inhibited and heterotrophic bacteria reduced, resulting in the abundance of AOB recovered. Nevertheless, the ammonium transformation pathway was suppressed because genes amoABC and hao were obviously reduced, leading to the deterioration of reactor performance. Overall, these results provide theoretical guidance for the practical application of PN for the treatment of FA-containing sewage. 相似文献